A-4 Specifications
DC MEASUREMENT CHARACTERISTICS
DC Volts
A-D LINEARITY: 2.0 ppm of reading + 1.0 ppm of range.
INPUT IMPEDANCE:
100mV–10V Ranges:
Selectable >10GΩ// with <400pF or 10MΩ ±1%.
100V,1000V Ranges: 10MΩ ±1%.
INPUT BIAS CURRENT: <75pA at 23°C.
COMMON MODE CURRENT: <500nApp at 50Hz or 60 Hz.
AUTOZERO ERROR: Add ±(2ppm of range error + 5µV) for < 10 minutes and ±1°C.
INPUT PROTECTION: 1000V, all ranges. 300V with plug in modules.
Resistance
MAX 4WΩ LEAD RESISTANCE: 10% of range per lead for 100Ω and 1kΩ ranges; 1kΩ per lead for all other ranges.
OFFSET COMPENSATION: Selectable on 4WΩ 100Ω, 1kΩ, and 10kΩ ranges.
CONTINUITY THRESHOLD: Adjustable 1 to 1000 Ω
INPUT PROTECTION: 1000V, all Source Inputs, 350V Sense Inputs. 300V with plug-in modules.
DC Current
SHUNT RESISTORS: 100mA–3A, 0.1Ω. 20mA, 5Ω.
INPUT PROTECTION: 3A, 250V fuse.
Thermocouples
CONVERSION: ITS-90.
REFERENCE JUNCTION: Internal, External, or Simulated (Fixed).
OPEN CIRCUIT CHECK:Selectable per channel. Open >12kΩ.
EARTH ISOLATION: 500V peak, >10GΩ and <150pF any terminal to chassis.
DC Notes
1. 20% overrange except on 1000V and 3A.
2. Add the following to “ppm of range” uncertainty; 100mV 15ppm, 1V and 100V 2ppm, 100Ω 30ppm, <1MΩ 2ppm, 10mA and 1A 10ppm, 100mA 40ppm.
3. ±2% (measured with 10MΩ input resistance DMM, >10GΩ DMM on 10MΩ and 100MΩ ranges).
4. Relative to calibration accuracy.
5. For signal levels >500V, add 0.02ppm/V uncertainty for portion exceeding 500V.
6. Specifications are for 4-wire Ω, 100Ω with offset compensation on. With offset compensation on, OPEN CKT. VOLTAGE is 12.8V. For 2-wire Ω add 1Ω addi-
tional uncertainty.
7. Must have 10% matching of lead resistance in Input HI and LO.
8. Add the following to “ppm of reading” uncertainty when using plug in modules: 10MΩ 220ppm, 100MΩ 2200ppm. For Model 7703, add the following:
10kΩ 10ppm; 100kΩ 100ppm; 1MΩ 1000ppm; 10MΩ 1%; 100MΩ 10% for <40% R.H. operating environment.
9. Add 1V when used with plug in modules.
10.For RATIO, DCV only. For AVERAGE, DCV and Thermocouples only. Available with plug in modules only.
11.Add 6µV to “of range” uncertainty when using Model 7703.
12.Auto zero off.
13.For LSYNC On, line frequency ±0.1 %. For LSYNC Off, use 60dB for ≥ 1PLC.
14.For 1kΩ unbalance in LO lead. AC CMRR is 70dB.
15.Speeds are for 60Hz (50Hz) operation using factory defaults operating conditions (*RST). Autorange off, Display off, Limits off, Trigger delay=0.
16.Speeds include measurements and binary data transfer out the GPIB.
17.Sample count = 1024, auto zero off.
18.Auto zero off, NPLC = 0.01.
19.Add ±0.5°C uncertainty for type J, K, N, T, and E for temperatures <–100°C, for types R and S <+400°C, and for type B <+1100°C. Guaranteed by design for
types B, E, N, R, and S.
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