12B/18/7 Series
Service Manual
1-4
Table 1-1. Specifications (continued)
Function
Overload
Protection
1
Input
Impedance
(Nominal)
Common Mode
Rejection Ratio
(1 kΩ
Unbalanced)
2
Normal Mode
Rejection
2
f
600V rms or dc
>5 MΩ <100pF
2
Automatic Selection
and LoZ = >2 kΩ
<200pF
(ac coupled)
3
>60 dB at dc 50 or
60 Hz
E
600V rms or dc
>10MΩ <100pF
2
Automatic Selection
and LoZ = >2 kΩ
<200pF
3
>100 dB at dc, 50 or
60 Hz
>50 dB at 50 Hz or
60 Hz
Open Circuit
Test Voltage
Full Scale Voltage
To 4.0 MΩ 40 MΩ
Short Circuit
Current
J
600V rms or dc <1.5V dc <450 mV
dc
<1.5V dc <500 µA
L
2
600V rms or dc 2.4-3.0V dc 2.400V dc 0.95 mA (typical)
1. 3 x 10
6
V Hz maximum.
2. Does not apply to Model 7.
3. ~2 kΩ input impedance up to 50V. Impedance increases with input voltage to >300 kΩ at 600V.
MIN MAX Recording Accuracy and Response Time (Models 12B and 18)
Specified accuracy of the measurement function ±12 digits for changes >200 ms in duration
(±40 digits in ac). Typical 100 ms response to 80%.
MIN MAX Recording with Elapsed Time (Models 12B and 18)
Elapsed Time: 0 to 100 hours (99.59)
Resolution: 1 minute
Accuracy: 0.3% typical
Continuity Capture (Model 12B)
(Open/Short Capture Model 18)
Detects opens or shorts of 250 µs or longer.
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