6-2 Range, Digits, Speed, and Filters Models 2500 and 2502 User’s Manual
Range and digits
Measurement range
The selected measurement range affects the accuracy of the measurements as well as the
maximum signal that can be measured.
Available ranges
Table 6-1 lists the available current measurement ranges, resolution values, and maximum
readings for each Model 2500 channel.
NOTE The current measurement range can be individually set for each channel.
Maximum readings
As shown in Table 6-1, the full scale input for each current measurement range is 105% of
the selected range. For example, ±21mA is the full scale reading for the 20mA range.
Input levels that exceed the maximum levels cause the “Oflo” message to be displayed.
Manual ranging
Press the MSR1 or MSR2 key, then use the RANGE and keys to select a fixed chan-
nel 1 or channel 2 manual range.
NOTE Use the lowest range possible without causing an overflow to ensure best accu-
racy and resolution.
Table 6-1
Current measurement ranges
Model 2500
I-range
Maximum
resolution
Maximum
reading
2nA
20nA
200nA
2µA
20µA
200µA
2mA
20mA
1fA
10fA
100fA
1pA
10pA
100pA
1nA
10nA
±2.1nA
±21nA
±210nA
±2.1µA
±21µA
±210µA
±2.1mA
±21mA
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