DC Voltage Characteristics |
Overrange |
20% on 100 mV, 1 V, 10 V, and 100 V ranges. 1% on 1000 V range. |
ADC Linearity (10 V range) |
0.0001% of 10 V range |
Input Impedance |
100 mV to 10 V Ranges: Selectable, >10 GΩ or 10 MΩ ±1%)in parallel with <400 pF.
100 V to 1000 V Ranges: 10 MΩ ±1% in parallel with <400 pF |
Input Bias Current |
<50 pA at 23°C |
Common Mode Current |
<600 nA peak-peak at 50 Hz or 60 Hz |
Earth Isolation |
500 Vpeak >10 GΩ and <300 pF any terminal to chassis |
Common Mode Voltage |
500 Vpeak LO terminal to chassis maximum |
Autozero Off Error |
Add ±(0.0002% of range + 3 µV) within ±1°C and ≤10 minutes since last autozero.
Add ±(0.0010% of range + 10 µV) within ±5°C and ≤60 minutes since last autozero |
Input Protection |
Front-panel DAQ input: Input HI 1010 V, Sense HI (SHI) and Sense LO (SLO) 350 V referenced to LO
Rear-panel DAQ input through the plug-in modules: 600 VPEAK all ranges (note this level exceeds the maximum input signal for modules: see the table below for module levels) |
Resistance Characteristics |
Overrange |
20% on all ranges |
Autozero Off Error |
Add ±(0.0005% of range + 5 mΩ) within ±1°C and ≤10 minutes since last autozero
Add ±(0.0020% of range + 10 mΩ) within ±5°C and ≤60 minutes since last autozero |
Offset Compensation |
Selectable on 1 Ω, 10 Ω, 100 Ω, 1 k Ω, and 10 kΩ ranges, 4-wire mode only |
Maximum 4-wire Lead Resistance |
5 Ω per lead for 1 Ω range
10% of range per lead for 10 Ω, 100 Ω, 1 kΩ, and 10 kΩ ranges
1 kΩ per lead for 100 kΩ, 1 MΩ, 10 MΩ, and 100 MΩ |
Open Lead Detector |
Selectable on all ranges, 4-wire mode only; default is off. |
Input Protection |
Front-panel DAQ input: Input HI 1010 V, Sense HI (SHI) and Sense LO (SLO) 350 V referenced to LO
Rear-panel DAQ input through the plug-in modules: 600 VPEAK all ranges (note this level exceeds the maximum input signal for modules: see maximum input signal levels for 7700 series plug-in modules listed in DC Voltage Characteristics or separately supplied module specifications) |
DC Current Characteristics |
Overrange |
20% on 10 ΩA, 100 ΩA, 1 mA, 10 mA, 100 mA, and 1 A ranges 1% on 3 A range |
Front-Panel Input Protection |
Externally accessible 3 A, 250 V fast-acting fuse, 5 × 20 mm: Keithley replacement part number FU-99-1 |
Plug-in Module Input Protection |
Fuse provided in 7700 and 7702 plug-in modules; PCB-mounted 3 A, 250 V, fast-acting fuse |
Autozero Off Error |
Add ±0.004% of range within ±1°C and ≤10 minutes since last autozero
Add ±0.015% of range within ±5°C and ≤60 minutes since last autozero |
Nominal Shunt Resistance14 |
10 µA |
100 µA |
1 mA |
10 mA |
100 mA |
1 A |
3 A |
10 kΩ |
1 kΩ |
100 Ω |
10 Ω |
1 Ω |
100 mΩ |
100 mΩ |
AC Voltage Characteristics |
Overrange (voltages in VRMS ) |
20% on 100 mV, 1 V, 10 V, and 100 V ranges. 0% for 750 V range. |
AC Measurement Method |
AC-coupled digital sampling with anti-alias filter |
Crest Factor (excludes sine wave) |
Crest factors of up to 3:1 at full-scale input or 10:1 maximum, whichever is greater
Autorange selects optimum range for crest factor up to 10:1Accuracy specifications apply to all crest factors and are limited to a product of (crest factor) × (fundamental frequency) ≤ 3 kHz |
Volt*Hertz Product |
≤8 × 107 V*Hz21 |
Common Mode Rejection Ratio |
>70 dB, for 1 kΩ unbalance in LO lead |
Detector Bandwidth |
Setting of 3 Hz, 30 Hz, or 300 Hz sets maximum measurement aperture of 200 ms, 20 ms, or 2 ms, respectively; only signals with frequency greater than the detector bandwidth are measured. |
Input Impedance |
1.1 MΩ ±2%, in parallel with <100 pF |
Input Protection |
Front-panel input: 1100 VPEAK or 400 VDC on all ranges
Rear-panel input through the plug-in modules: 600 VPEAK on all ranges (note this level exceeds the maximum input signal for modules; see Maximum Input Signal Levels for 7700 Series plug-in modules listed below. |
Maximum DCV |
400 V on any ACV range |
ACV Frequency |
Frequency reading automatically returned in reading buffer when in full buffer mode.
Frequency readings are specified as in the frequency and period table. |
AC Current Characteristics |
Overrange |
20% on 100 µA, 1 mA, 10 mA, 100 mA, and 1 A ranges1% on 3 A range |
AC Measurement Type |
AC-coupled true RMS; measures the AC component of the input Digital sampling with anti-alias filter. |
Input Protection |
See DC Current Characteristics |
Crest Factor27 (excludes sine wave) |
10:1 maximum crest factor (1.75:1 at full-scale)
Autorange selects optimum range for crest factor up to 10:1
Accuracy specifications apply to all crest factors less than 5 and are limited to the product of (crest factor) × (fundamental frequency) ≤ 200 Hz |
ACI Frequency |
Frequency readings are automatically returned in the reading buffer when in full buffer mode.
Frequency values are typical. |