Keithley 2700 User Manual

Model 2700 Multimeter/Switch System User’s Manual Rel, Math, Ratio, Channel Average, dB 5-17
Basic operation
NOTE Make sure the INPUTS switch is set to the REAR position (in).
1. Select and configure (range, filter, rel, etc.) a valid measurement function. For
ratio, the only valid function is DCV. For channel average, the only valid functions
are DCV and TEMP (TCs only).
2. Use the  or  key to select (close) a primary channel (101 through 110 for the
Model
7700). The CLOSE key can also be used.
3. Apply one signal to the selected primary channel, and apply the other signal to the
paired channel. For the Model 7700, if the closed primary channel is 101, the
paired channel is 111.
4. Enable Ratio or Channel Average:
• Ratio — Press SHIFT and then RATIO. The RATIO annunciator will turn on
to indicate that the displayed readings are the result of the ratio calculation.
• Channel Average — Press SHIFT and then CHA-AVG. The DELTA
annunciator will turn on to indicate that the displayed readings are the result of
the channel average calculation. To disable channel average, again press
SHIFT and then CH-AVG.
5. When finished, there are two ways to disable the calculation:
• Press the OPEN key. The calculation will disable and the channel will open.
• Press SHIFT and then RATIO to disable ratio, or press SHIFT and then
CHA-AVG to disable channel average. The calculation will disable, but the
channel will remain closed.
NOTE The paired channel number is not displayed when it is measured. Only the
primary channel is displayed during the 2-channel scan for the calculation.
Enabling ratio disables channel average and conversely, enabling channel
average disables ratio.
If either of the channel readings over range (“OVRFLW”), the result of the
calculation will also be “OVRFLW.”
When using limits with ratio or channel average, the limit values will be
compared to the result of the calculation and not to the individual channels.
With ratio or channel average enabled, pressing a function key will display the
“EXIT RATIO” or “EXIT CHA-AVG” message to indicate that the calculation
must first be disabled as explained in step 5 of the above procedure.

Keithley 2700 Specifications

General

Type	Digital Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Temperature Range	-200°C to +1372°C
Display	Vacuum Fluorescent Display
Connectivity	IEEE-488, RS-232
Channels	10
Power Supply	100V to 240V AC, 45Hz to 66Hz
DC Current Range	10 µA to 3 A
AC Current Range	10 µA to 3 A
Temperature Measurement	Thermocouple, RTD