Electrical Test & Measurement · Electrical Safety Testers
Compact scanning safety tester with two, four or eight channels, AC and DC withstand, insulation resistance to 50 GΩ and nine-level arc detection.
ZX9320SA-2 (4 models) ·
A multi-point insulation test is only as repeatable as the switching between its points. Once the leads stop moving, the result depends on the instrument’s channel handling and on the sequence it runs, and those are the two things worth comparing.
The range is built around a common test engine in bodies of different widths, with two, four or eight scanning channels. One family carries the alternating output only; the others add a direct output and an insulation resistance measurement. The channel count and the resistance range are the two figures that separate the models.
Channels are switched inside the instrument rather than by moving leads, so a fixture is wired once and the sequence steps through it. Stored files hold a complete test sequence, and those files can be copied to a USB drive and carried to another instrument of the same kind.
The high voltage is raised over a programmed rise time, held for the test time and brought down over a fall time, and the current is compared with an upper and a lower limit throughout the hold. The upper limit is the breakdown criterion; the lower limit catches an item that is not connected, and it can be switched off for an item whose leakage is genuinely below the threshold.
In multi-channel mode the instrument switches the high voltage from one channel to the next and runs the stored step against each in turn. The original output terminals stay live and can act as a common return, which is what allows a fixture with one shared chassis point to be wired without switching the return as well.
Arc detection runs alongside the current comparison rather than replacing it. It responds to a fast change superimposed on the test current, which an ordinary current measurement averages away, and the nine levels correspond to progressively lower current thresholds.
Insulation resistance is measured at a lower direct voltage, and the accuracy is quoted in three bands because the current being measured falls into the nanoamp region at the top of the range. That is why the tolerance widens with resistance rather than staying constant.
Count the points first, then decide whether the fixture will grow. Two channels cover a transformer with a primary and a secondary; four cover a three-phase item with a chassis point; eight cover a harness or a multi-winding component. The control, the memory and the sequence language are the same across the range, so the channel count is a fixture decision rather than a user-interface one.
The second question is whether a direct test and an insulation measurement are needed. One family carries the alternating output only, and the difference cannot be added later, so a product standard that calls for a direct test or a resistance reading decides the family before the channel count is considered.
The third is the resistance range. The eight-channel models are listed with a narrower range than the two- and four-channel ones, and an item near the top of the range needs the wider model even if it has few points. Reading the range from the channel count is the mistake this table invites.
The fourth is how the results leave the bench. A handler interface and a pass or fail output suit an automated cell, while the serial port and the USB host suit a bench that records results per unit or moves setups between instruments.
Switching adds a path that a single-channel instrument does not have. The channel relay, the fixture wiring and the common return all sit in series with the measurement, and at the top of the resistance range the leakage across that path can be comparable with the leakage through the item. A reading that looks like a failure at one channel and not at another is more often the fixture than the product.
The lower current limit is a useful check but a blunt one. On an item with very low leakage it will report a good connection as a failure, which is why the material provides a way to switch it off, and why the decision to use it should be made per product rather than per bench.
Arc detection is a threshold, not a measurement. Its value depends entirely on where it is set, and the current at each level is the only guide the material gives. Setting it against a known good item, at the voltage the test actually uses, is the only way to make it mean something.
Finally, the two body depths given in the material differ between the single-channel family and the multi-channel group, and the weight of the multi-channel bodies is not stated at all. A bench or a rack should be planned after those figures are confirmed rather than from this page.
Every value below is taken from source documentation. Where a parameter is not stated in the available material it is marked as information required rather than estimated.
| AC output voltage | 0.05 to 5.00 kV, ±2%Standard |
|---|---|
| DC output voltage | 0.05 to 6.00 kV, ±2%, not fitted to AC-only modelsStandard |
| Voltage regulation | ±(1.0% + 10 V) at rated powerStandard |
| AC current range | 0 to 10.00 mA on the 9310 family; 0 to 20.00 mA on the 9320 familyStandard |
| DC current range | 0 to 5.00 mA on the 9310 family; 0 to 10.00 mA on the 9320 familyStandard |
| Test accuracy | ±(5.0% of reading + 5 counts), while the model table states ±2%Standard |
| Rise time | 0.1 to 999.9 sStandard |
| Fall time | 0.1 to 999.9 sStandard |
| Wait time | 0.2 to 999.9 sStandard |
| Test time | 0.2 to 999.9 sStandard |
| Discharge | Fast discharge at the end of the direct testStandard |
| Output voltage | 0.05 to 1.00 kV, ±2%Standard |
|---|---|
| Resistance range | 0.1 to 50 GΩ on the 9320 single-channel models and the two- and four-channel models; 0.1 to 10 GΩ on the eight-channel modelsStandard |
| Accuracy at 50 to 1000 V, 0.1 to 999 MΩ | ±10%Standard |
| Accuracy at 50 to 1000 V, 1.00 to 10 GΩ | ±20%Standard |
| Accuracy at 500 to 1000 V, 10 to 50 GΩ | 25% of readingStandard |
| Discharge | Automatic at the end of the testStandard |
| Arc detection levels | 1 to 9, factory default 5Standard |
|---|---|
| Arc current at each level | 20, 18, 16, 14, 12, 10, 7.7, 5.5 and 2.8 mA from level 1 to level 9Standard |
| Leakage upper limit | A reading above the set upper limit is judged HI FAILStandard |
| Leakage lower limit | A reading below the set lower limit is judged LOW FAIL, and the function can be switched off for items with very low leakageStandard |
| Comparator output | Pass and fail indicated by lamp, by tone and through the handler interfaceStandard |
| Memory | 120 groups of 100 steps in the parameter table; 64 files of 100 items in the feature textStandard |
|---|---|
| Test modes | Four modes, which can be combinedStandard |
| Keyboard lock | Locks the front panel and protects the stored dataStandard |
| Retention | Test conditions are saved at power offStandard |
| File transfer | Stored files can be copied to a USB drive and moved to a PC or another instrumentStandard |
| Interfaces | HANDLER, RS232 and USB host as standardStandard |
| Remote control | Full remote control and data collection through the command setStandard |
| Dimensions, single-channel family | 310 × 110 × 415 mmStandard |
|---|---|
| Dimensions, multi-channel group | 310 × 110 × 315 mmStandard |
| Weight, single-channel family | 15.5 kgStandard |
| Weight, multi-channel group | Not stated in the materialInformation required |
| Input supply | 110 V at 60 Hz or 220 V at 50 Hz, 250 VA, from the rear panel markingStandard |
| Fuse | T5AL250V on the 110 V marking and T3AL250V on the 220 V markingStandard |
| Operating temperature and humidity | Not stated in the materialInformation required |
| Calibration certificate | Not stated in the materialInformation required |
| Ingress protection | Not stated in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| ZX9320SA-2 | Two channels, AC and DC with insulation | AC to 5 kV, DC to 6 kV, 0.1 to 50 GΩ | Two test points with a full function set |
| ZX9320SA-4 | Four channels, AC and DC with insulation | AC to 5 kV, DC to 6 kV, leakage to 10 mA, 0.1 to 50 GΩ | The four-channel version described in the summary table |
| ZX9320SA-8 | Eight channels, AC and DC with insulation | AC to 5 kV, DC to 6 kV, 0.1 to 10 GΩ | Eight test points, resistance range limited to 10 GΩ |
| ZX9310SA-8 | Eight channels, AC and DC with insulation | AC to 5 kV, DC to 6 kV, 0.1 to 10 GΩ | Listed with the same summary figures as the other eight-channel model |
Certifications are only published once a certificate copy can be produced, so this section is deliberately empty rather than populated with assumed approvals. Tell us which approvals your application requires and we will confirm what is available for this instrument.
The following are required for a complete specification but are not stated in the documentation supplied to us. They are listed rather than estimated:
The channels are switched inside one instrument, so the high voltage source, the measurement circuit and the stored sequence are shared. That is what keeps the result comparable from point to point. It also means one failure can stop the sequence, and the fixture has to be wired so that unused channels are not left open.
Yes. The material states that the output terminals keep their original function and can be used as a common point while the channels are scanning. That is useful for an item with one shared return and several points to be tested in turn, because the return does not have to be switched.
The eight-channel models are listed with a range that stops an order of magnitude below the two- and four-channel models. The material does not explain the difference, so the range should be treated as a specification of the model rather than as a margin. An item whose insulation is near the top of the range needs the wider model.
The number of test points, which fixes the channel count; whether a direct withstand test and an insulation test are required, since some models carry only the alternating output; the highest insulation resistance the product standard asks for, which separates the eight-channel models from the others; and the site supply, because the rear panel is marked for two different voltages and frequencies.
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