Vitrek’s 944i Hipot Tester combines AC dielectric strength testing (AC Hipot) with DC dielectric strength testing (DC Hipot), Insulation Resistance (HV IR) and a low Ohmic Earth Continuity measurement all in one feature-rich automated instrument. This compact dielectric tester lets you measure four electrical safety test parameters from a single test connection-all with the touch of a button.
AC DIELECTRIC MODE:
AC Voltage Output
Voltage uncertainty is equal to the square root of the selected output. (V1/2)
Output |
Formula |
Accuracy |
100 VAC |
(100)1/2 |
± 10.0 VAC |
500 VAC |
(500)1/2 |
± 22.4 VAC |
1000 VAC |
(1000)1/2 |
± 31.6 VAC |
5000 VAC |
(5000)1/2 |
± 70.7 VAC |
Output Frequency: 50Hz to 100Hz with 1Hz resolution independent of line power frequency.
Output Waveform: Digitally synthesized, low distortion sine wave.
AC Current Sensing (AC Leakage)
Range |
Resolution |
Accuracy |
12.00uA |
10nA |
0.5% of reading ± 1uA |
1.200mA |
1uA |
0.5% of reading ± 10uA |
35.0mA |
100uA |
0.5% of reading ± 500uA |
Current Sensing: Resistive current (in-phase), reactive current (out-of-phase) or total current.
AC Current Limits
Range |
Current Limit |
50 to 5000 VAC |
35 mA |
DC DIELECTRIC MODE:
DC Voltage Output
Voltage uncertainty is equal to the square root of the selected output times 0.75. (V1/2 *0.75)
Output |
Formula |
Accuracy |
100 VDC |
(100)1/2 * 0.75 |
± 7.5 VDC |
500 VDC |
(500)1/2 * 0.75 |
± 16.8 VDC |
1000 VDC |
(1000)1/2 * 0.75 |
± 23.7 VDC |
5000 VDC |
(5000)1/2 * 0.75 |
± 53.0 VDC |
7000 VDC* |
(7000)1/2 * 0.75 |
± 62.7 VDC |
* Requires option DC-7
DC Current Sensing (DC Leakage)
Range |
Resolution |
Accuracy |
0 - 1720 ηA |
1ηA |
0.4% of reading ± 8 ηA |
1.720 μA - 17.30 μA |
0.01μA |
0.3% of reading ± 0.05μA |
17.30μA - 1.785mA |
0.001mA |
0.3% of reading ± 0.015 mA |
1.785 mA - 35.50 mA |
0.01 mA |
0.3% of reading ± 0.1 mA |
Voltage Coefficient: 15pA/V
DC Current Limits:
Range |
Current Limit |
50 to 5,000 VDC |
35.5mA |
5,000 to 7,000 VDC* |
19mA |
* Requires DC-7 option
DC Voltage Output with Optional DC-10:
Voltage uncertainty is equal to the square root of the selected output times 1.5.
(AC Voltage specs remain the same as the standard 944 as described above)
Examples:
Output |
Formula |
Accuracy |
100 VDC |
100)1/2 * 1.5 |
± 15.0 VDC |
500 VDC |
(500)1/2 * 1.5 |
± 33.5 VDC |
1000 VDC |
(1000)1/2 * 1.5 |
± 47.4 VDC |
5000 VDC |
(5000)1/2 * 1.5 |
± 106.1 VDC |
7000 VDC* |
(7000)1/2 * 1.5 |
± 125.5 VDC |
10000 VDC* |
(10000)1/2 * 1.5 |
± 150.0 VDC |
DC Current Limits with option DC-10 :
(Output power is limited to 165 Watts)
Range |
Current Limit |
50 to 10,000 VDC |
15.5mA |
10,001 to 14,000 VDC |
10.0 mA |
HIGH RESISTANCE MODE:
(Insulation Resistance)
(Firmware limits to minimum of 1.9kOhms. Output power can not exceed 165 Watts for standard units, 135 Watts for CLT option and 130 Watts for FR-4 mod).
Resistance Range
(guaranteed in spec) |
Minimum Resistance |
Test Voltage |
2.6GΩ |
1.9KΩ |
>= 50VDC |
13GΩ |
500KΩ |
>= 500VDC |
26GΩ |
1MΩ |
>= 1,000VDC |
65GΩ |
2.5MΩ |
>= 2,500VDC |
Accuracy: Combined uncertainty of DC Voltage Output + Current Measurement Accuracy
LOW RESISTANCE MODE:
(Earth Continuity)
Full Scale |
10 Ω Maximum including lead resistance. |
Resolution |
1mΩ |
Test Current |
50 mA |
Lead Compensation |
Automatic offset circuit "nulls" out two wire lead resistance |
Accuracy |
0.3% of reading + 30mΩ (up to 5Ω) |
GENERAL SPECIFICATIONS:
Arc Detection Sensitivity |
User selectable. Fast = 1 arc in a 100mS period. Medium = 15 arcs in a 100mS period. Slow = 50 arcs in a 100mS period. |
Display |
40 character alphanumeric LCD |
High Voltage Indicator |
Lightning bolt illuminated by independent output voltage monitor. Audible alarm sounds prior to voltage output unless disabled in firmware. |
Voltage Resolution |
Output resolution is typically 3-4 volts AC or DC on standard units. DC-10 and AC-10 outputs have a 6-8 volt resolution. LVIR output resolution is 0.2 volts. Measurement resolution is 1 Volt on all units, all options. |
Dwell Time Accuracy |
+2 seconds/minute, -500mS/minute |
Slew Rate |
1 volt/second to 30000 volts/second. Firmware limits all ramps to a minimum total time of 1 second. Actual ramp times vary dependent on load. Ramp times are consistent when testing similar devices. Test engineers should always observe the test with an oscilloscope and adjust parameters to achieve desired results with each specific device under test. |
Limits |
Test automatically aborts when digitally stored minimum or maximum limit is exceeded. Current and resistance minimums will not trigger failures until >0.8 seconds of dwell time has elapsed to allow for settling of DUT at dwell voltage. |
Remote Interface Option "IF-4" |
GPIB - IEE-488.2 Subset compatible
RS-232C - 9600 Baud
Parallel - IBM/Centronics compatible
VICL - Vitrek Interface Control Loop (slaved to RS-232 interface) |
Accuracy |
Stated specifications are bipolar and apply for one year within ± 5°C from calibration temperature (20 to 25°C). |
Temperature Coefficient |
0.1 times stated accuracy per °C beyond calibration temperature window |
Calibration |
Traceable to the National Institute of Standards and Technology (NIST). Automatic "Covers on" calibration, internal or external. Calibration constants stored in non-volatile memory. |
Warm up Time |
No warm up time is required for units stored in ambient temperatures ranging from 64°F to 82°F (18°C to 28°C). A minimum 30 minute warm up time is recommended for units stored in temperatures outside that range. A minimum 60 minute warm up time is recommended prior to performing an external calibration procedure. |
Operating Temperature |
64°F to 82°F (18°C to 28°C). Ensure units are well ventilated and fan is operational at all times. Fan should be sucking fresh cool clean air into unit for optimal performance. Overheating and freezing may result in unexpected resetting or lockup of units. Keep vents clear. |
Humidity |
Maximum 90% RH |
Power Consumption |
115/230 VAC ± 10%, 350 VA Max. Typical 40-50 Watts power consumption in idle mode. Up to 300 Watts when sourcing maximum output power to test device. Power consumption varies with load during testing. |
Dimensions |
89mm H x 432mm W x 457mm D (3.5" H x 17" W x 18" D) |
Weight |
14Kg (34 lb.) Net / 18Kg (40 lb.) Shipping |
