The 98x Series megohmmeters meet today's demanding requirements for higher-voltage IR (insulation resistance) testing.

In the relentless race for higher efficiency, EV and solar panel arrays now operate at voltage rails up to 2.5 kV. A 1 kV tester won't cut it here—it's time to upgrade to the Vitrek 98x!

Built on the same DSP technology that made Vitrek a leader in hipot test systems, the 98xi instruments deliver a unique combination of performance features, including:

• Multi-dwell capability (multiple steps without returning to zero between steps)

• High-speed testing (dwell times as low as 100 ms)

• Pico-amp leakage measurement (with stable, accurate 50-terraohm IR readings)

• Continuously variable IR test voltage (adjustable across the instrument's full output range)

• Multi-mode insulation resistance testing (three test modes—end on time, end on pass, end on fail)

• Capacitance test mode (essential for solar panels, cable harnesses, and other capacitive loads)

For applications requiring insulation resistance testing of multiple conductors, Vitrek 98×1 IR testers can directly control up to four 64-channel Vitrek 964i high-voltage scanners. With a PC running Vitrek QT Enterprise™ software, a single instrument can handle up to 1,020 test points.

The new 981i and 983i megohmmeters are engineered for the most demanding high-resistance measurement applications—rugged applications that most other IR testers simply cannot handle. So when you need to test higher-voltage IR values, such as today's EV systems and higher-voltage solar arrays, look to Vitrek for the IR tester your production line needs.

What sets the Vitrek 98x Series IR testers apart?
First, these units are built on Vitrek's proven DSP technology, so they can operate into capacitive loads that most other equipment cannot handle. In terms of output voltage range, Vitrek offers the 981i up to 6.5 kVDC and the 983i up to 11 kV.

Need to run insulation resistance tests on multi-conductor harnesses?
Out of the box, the 981i and 983i can directly control up to four 64-channel high-voltage scanners. That's up to 256 test points, and with a PC running Vitrek Q-Test software, the count can be expanded to 1,020 test points. The high-voltage switching system of choice is the Vitrek 964i, which accommodates eight 8-channel switch cards with 7, 10, and 15 kV ratings.

In the relentless race for higher efficiency, EV and solar panel arrays now operate at 2.5 kV.
A 1 kV tester won't cut it here—it's time to upgrade to the 98x!

Product Features and Benefits

Specifications

General specifications

Specifications: Valid after 15 minutes warm-up, 1 year from last external calibration, ambient temperature within +/- 2 degrees Celsius of when zero was last performed.

Ethernet: High-speed, high noise immunity LAN interface
RS232 interface: Selectable baud rates: 9600, 19200, 38400, 57600, or 115200, full handshaking
VICL interface: For controlling high-voltage scanners
Digital I/O interface: provides 4 digital inputs and 5 digital outputs. Functions include start/stop, test, pass/fail, high-voltage present, safety interlock, dwell timer
Optional GPIB: option GPIB-9 adds GPIB interface capability
Operating temperature: 0°C to 50°C
Humidity: <85% RH (non-condensing)
Power: 105-265Vrms, 45-65Hz, 500VA max
Dimensions: 89mm H x 432mm W x 457mm D (3.5" H x 17" W x 18" D)
Weight: 5 kg (11 lb.) net / 7Kg (15 lb.)
Accessories: Alligator test leads, NIST-traceable calibration certificate without data, power cord, and operation manual. Limited ISO 17025 calibration certificate with data and uncertainty available.

DC output voltage

981i: 30V to 6500V
Accuracy: +/- (0.25% reading + 0.1V)
981i with Option HSS2: 30V to 5000V
Accuracy: +/- (0.25% reading + 0.1V+1V/mA)
983i: 60V to 11000V
Accuracy: +/- (0.25% reading + 0.2V)
Output resolution: 1V
Load: Up to 4mA charging, 2mA continuous

Current measurement

981i and 983i return current only, 1pA to 4mA
Accuracy (resistive load up to 1000pF): +/- (0.5% reading + 10pA + 2pA per kV)
Accuracy (capacitive load 1000pF to 50nF): +/- (0.5% reading + 100pA + 20pA per kV)
Accuracy (capacitive load >50nF): +/- (0.5% reading + 1nA + 200pA per kV)

Option HSS2 HV output current: 1nA to 4mA (grounded load)
Accuracy (resistive load up to 1000pF), C<1000pf): + -="" 5na="" 1na="" 1000pf="" 7.5na="" 2.5na="">50nF): +/- (0.5% reading + 10nA + 5nA per kV)

Resistance measurement
Note: Using the OFFSET (or ZERO) function in automatic or manual test mode does not require meeting these specifications—the OFFSET function is designed to allow users to cancel externally generated leakage.

Transfer measurement

Comparative measurement capability (multiple values within 10% measured within 1 hour under the same test voltage, same ambient conditions of +/-1C, without intervening zero operation, constant power)

Uncertainty (resistive load): +/- (0.05%rdg + (R/(5Tohm per kV))%rdg + (1/V)%rdg + 2ohms per kV) for R < 150Tohm

Timing

Charge time: minimum charge time 1 second, maximum 9999 seconds.
Dwell time: 0.1 seconds to 9999 days, with 0.1 second resolution