General Information vii
Measuring Characteristics
Min Typ Max Units
Autoranging limits Range 1 1.90000 V
Range 2 .95000 1.99999 V
Range 3 190.00 999.99 mV
Range 4 199.999 mV
Input Resistance [8] 9.9 10.0 10.1 MΩ
3 GΩ
Bias current [9] 1 pA
Terminals Isolated BNC [10]
Protection, center to shield ±60 V
Protection, shield to Earth ±200 V
Trigger Source Local, external, or remote
External input Rear BNC; TTL; active LOW
Latency 480 µs
BUSY output Rear BNC; TTL; active HIGH
BUSY impedance 50 Ω
Measurement Method 24-bit, Delta-Sigma A/D converter
A/D linearity Corrected by firmware [11]
Normal-mode rejection [12] 90 dB
Common-mode rejection, DC [13] 125 dB
Output Update frequency, 50 Hz FPLC [5] 3.0 Hz
Update frequency, 60 Hz FPLC [5] 3.6 Hz
Settling time, Ranges 1–3 [5, 14] 1 s
Settling time, Range 4 [5, 14] 10 s
Displays Red numeric LED, 0.30”
Green LED, range and autorange
Operating Temperature [15] 0 40 ◦C
Power +5 V DC
Supply current 480 mA
Conditions:
[8] Input resistance is 10 MΩfor Ranges 1 through 4. Operating modes
with >3 GΩinput resistance exist (Table 2.1).
[9] At 23 ◦C.
[10] Amphenol 31–10–4052 or similar.
[11] Included in the accuracy specifications.
[12] At power-line frequency (FPLC): 59 Hz to 61 Hz or 49 Hz to 51 Hz.
[13] For 1 kΩunbalance in the shield.
[14] To within 3 counts of the final reading, on a fixed range, for an input
voltage step of 50% of the maximum voltage for the range, for 0 Ω
source impedance.
[15] Non-condensing.
SIM970 Quad Digital Voltmeter
