Keithley 2750, User Manual

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4-2 Range, Digits, Rate, Bandwidth, and Filter Model 2750 Multimeter/Switch System User’s Manual
Range
The range setting is “remembered” by each measurement function. When you select a
function, the instrument will return to the last range setting for that function.
Measurement ranges and maximum readings
The selected range affects both accuracy of the measurement as well as the maximum
level that can be measured. The measurement ranges and maximum readings for all func-
tions, except FREQ, PERIOD, and TEMP, are listed in
Table 4-1 .
Input values that exceed the maximum readings cause the message “OVERFLOW” to be
displayed.
FREQ and PERIOD — Frequency measurements from 3Hz to 500kHz, and period mea-
surements from 2µs to 333µs can be made on the ACV ranges.
TEMP — There is no range selection for temperature measurements. Temperature mea-
surements are performed on a single, fixed range. Depending on which type of sensor is
being used, the maximum temperature readings range from –200°C to 1820°C.
Manual ranging
To change range, press the RANGE
Δ
or
∇
key. The instrument changes one range per
key press. The selected range is displayed for one second. Note that the manual range keys
have no effect on temperature (TEMP).
Table 4-1
Measurement ranges and maximum readings
Function Ranges
Maximum
reading
DCV 100mV, 1V, 10V, 100V, 1000V ±1010V
ACV 100mV, 1V, 10V, 100V, 750V 757.5V
DCI 20mA, 100mA, 1A, 3A ±3.1A
ACI 1A, 3A 3.1A
Ω
2 10
Ω
, 100
Ω
, 1k
Ω
, 10k
Ω
, 100k
Ω
, 1M
Ω
, 10M
Ω
, 100M
Ω
120M
Ω
Ω
4
*
1
Ω
, 10
Ω
, 100
Ω
, 1k
Ω
, 10k
Ω
, 100k
Ω
, 1M
Ω
, 10M
Ω
, 100M
Ω
120M
Ω
*Offset-compensated ohms and dry circuit ohms:
OCOMP — Offset-compensated ohms can be performed on the 1
Ω
, 10
Ω
, 100
Ω
,
1k
Ω,
and 10k
Ω
ranges.
DRYCKT — Available ranges for dry circuit ohms include the 1
Ω
, 10
Ω
, 100
Ω,
and 1k
Ω
ranges.
2750-900-01.book Page 2 Wednesday, August 3, 2011 7:56 AM