- Output voltage
- 100 to 1000 V DC, 1 V resolution, ripple below 2%
- Resistance range
- 1 MΩ to 9999 MΩ, automatically selected
- Resistance accuracy
- ±(2% of setting + 2 counts) from 1 to 1000 MΩ; ±(3% + 2 counts) to 9999 MΩ
- Rise time
- 1.0 to 999.9 s in the parameter table; 0.1 to 999.9 s in the description, both carried
- Test time
- 0 to 999.9 s, where zero means continuous
- Display
- Two-line, sixteen-character liquid crystal panel
- Remote control
- PLC interface with test, reset, three memory inputs and an interlock; pass, fail, processing and reset outputs
- Discharge
- Automatic at the end of the test, with a lamp showing below or above 30 V
- Supply
- 115 or 230 V AC ±15%, 50 or 60 Hz, 3.15 A fuse
- Body
- 280 × 89 × 390 mm, 8 kg
This instrument does one job in the older way: it applies a direct voltage, waits, and reads how much current the insulation lets through. What it adds to that is the set-up a production line needs, namely programmable times, a remote interface and an automatic discharge.
Product overview
Two models share the same measuring circuit and the same front panel layout. One performs the insulation test; the other adds a battery short-circuit function that the material names but does not specify.
The output is programmable over a decade from a hundred volts, and the resistance range reaches ten gigohms in two accuracy bands. Timing is set at both ends, a rise time before the reading and a test time during which the voltage is held.
The case is a bench instrument with a carry handle and a fan at the rear, and the high-voltage terminal is an isolated type rather than a plain post.
How the meter works
The instrument raises its output to the programmed voltage over the set rise time, holds it for the test time and measures the resulting current. Resistance is the ratio of the two, and the range is selected automatically as the reading settles.
The rise time exists because insulation behaves like a capacitor. Instant application of the voltage produces a charging current far larger than the leakage, and a reading taken during that period reports a resistance far lower than the true one. Allowing the voltage to rise, then holding it, separates the charging transient from the leakage that is actually being measured.
At the end of the test the output is discharged through an internal path, and a lamp reports whether the terminals are still above thirty volts. That lamp is the difference between a safe fixture and one that surprises the next operator.
The remote interface carries the start, reset and memory selection in, and the pass, fail and processing results out. The interlock input is the one that matters for safety: it lets a fixture cover prevent a test from starting while the cover is open.
How to select the right model
The first question is whether a battery short-circuit check is part of the procedure. If it is, the second model is the only choice, and its specification has to be obtained before the instrument is specified against a criterion.
The second is the resistance band. The accuracy changes above a gigaohm, so a test that has to judge a part near the top of the range is working in the looser band, and the pass limit has to be set with that in mind.
The third is the voltage. The output starts at a hundred volts, which is below the usual five hundred volt test but above the low-voltage tests that a component-level procedure may call for.
The fourth is the interface. A bench that is driven by a fixture needs the remote inputs and the three stored settings; a bench that is driven by hand does not, and the same instrument serves both.
Measurement limitations and selection considerations
The measurement range starts at a megaohm. That is a high floor: a contaminated assembly or a failed small component can read below it, and the instrument will report an over-range condition rather than a low resistance. Where low resistances have to be judged, a different instrument is required.
The accuracy is quoted against the setting rather than against the reading in the upper band, which is a distinction that matters when the reading is far from the limit. It also changes at a gigaohm, so a single accuracy figure does not describe the instrument across its range.
The panel marking of five kilovolts alternating and six kilovolts direct is well above the programmable output and should not be read as the working range. It describes the insulation of the output stage, and a quotation that repeats it as a capability would be wrong.
Nothing in the material describes the measurement method in detail, the time at which the reading is taken, or the standard the accuracy is quoted against. Those are the questions that decide whether the instrument can be used for a compliance test rather than a production check.
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.
