Keithley 2700 User Manual

7-2 Scanning Model 2700 Multimeter/Switch System User’s Manual
Scanning fundamentals
The Model 2700 can scan the channels of up to five installed Keithley switching modules.
Each scan channel can have its own unique setup. Aspects of operation that can be
uniquely set for each channel include function, range, rate, AC bandwidth, rel, filter,
digits, math,
Ω offset compensation, TEMP transducers, limits, channel average, channel
ratio, and volts dB.
NOTE Readings for scanned channels are automatically stored in the buffer. With
buffer auto clear enabled (which is the default), the buffer clears when the scan
is started. When disabled, scan readings are appended to the buffer. The
TRACe:CLEar:AUTO <b> command is used to enable/disable buffer auto clear
(
Section 6).
A pseudocard can be installed in an empty slot. With the 7700 pseudocard
installed, the instrument will operate as if a Model 7700 switching module is
installed in the slot. This allows the user to configure a scan and exercise its
operation before the switching module is installed in the Model 2700. Use the
following commands to install 7700 pseudocards in empty slots:
SYSTem:PCARd1 C7700 ‘Install’ 7700 pseudocard in slot 1.
SYSTem:PCARd2 C7700 ‘Install’ 7700 pseudocard in slot 2.
Pseudocards for other switching modules can instead be installed. Details on
installing other pseudocards are provided in
Section 2.
There are SCPI commands to query the capabilities of the installed switching modules.
For example, the following queries are provided to determine which channels of a Model
7700 in slot 1 are available for volts/2-wire ohms, and which channels are available for
amps. Note that the returned values for the Model 7700 switching module are shown in
parenthesis.
SYSTem:CARD1:VCHannel[:STARt]? ' Query first volt/Ω2 channel(7700; "1").
SYSTem:CARD1:VCHannel:END? ' Query last volt/Ω2 channel (7700; "20").
SYSTem:CARD1:ACHannel[:STARt]? ' Query first amps channel (7700; "21").
SYSTem:CARD1:ACHannel:END? ' Query last amps channel (7700; "22").
All the commands to query switching module capabilities are covered in Table 15-7.

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