Keithley 3706A Reference Manual

Table of contents Series 3700A System Switch/Multimeter Reference Manual
Basic scan procedure .............................................................................................................. 5-26
Remote interface scanning ..................................................................................................... 5-30
Hardware trigger modes .......................................................................................................... 5-31
Understanding synchronous triggering modes ........................................................................ 5-35
Events ..................................................................................................................................... 5-39
LXI Class B and C triggering (IEEE-1588) .............................................................................. 5-40
Reading buffers ........................................................................................................... 6-1
Reading buffers .................................................................................................................... 6-1
Buffer overview ......................................................................................................................... 6-1
Front-panel buffer operation ...................................................................................................... 6-2
Remote buffer operation ........................................................................................................... 6-6
Maintenance ................................................................................................................ 7-1
Introduction .......................................................................................................................... 7-1
Fuse replacement ................................................................................................................ 7-1
AMPS analog backplane fuse replacement ......................................................................... 7-2
Front panel tests .................................................................................................................. 7-3
Test procedure .......................................................................................................................... 7-3
Keys test ................................................................................................................................... 7-3
Display patterns test .................................................................................................................. 7-4
Displaying the instrument's serial number ........................................................................... 7-4
Upgrading the firmware ........................................................................................................ 7-5
Upgrading or downgrading firmware using the front panel ........................................................ 7-5
Upgrading or downgrading using the remote interface .............................................................. 7-6
Upgrading or downgrading firmware using the web interface.................................................... 7-6
Upgrading or downgrading firmware using Test Script Builder .................................................. 7-7
Theory of operation .................................................................................................... 8-1
Rear panel, backplane, and DMM connect relays schematic .............................................. 8-1
Line cycle synchronization ................................................................................................... 8-2
AC voltage measurements and crest factor ......................................................................... 8-5
DMM resistance measurement methods ............................................................................. 8-7
Constant-current source method ............................................................................................... 8-8
Ratiometric method ................................................................................................................... 8-9
Reference junctions ........................................................................................................... 8-11
Simulated reference junction ................................................................................................... 8-12
Internal reference junction ....................................................................................................... 8-12
External reference junction ..................................................................................................... 8-12
Open lead detection ........................................................................................................... 8-13
ISOUR open voltage ............................................................................................................... 8-15
VMEAS open voltage .............................................................................................................. 8-15
Calculated measurement open voltage ................................................................................... 8-15
dmm.opendetector open voltage ............................................................................................. 8-16
4-wire dry-circuit open lead detection ...................................................................................... 8-17
Open thermocouple detection ............................................................................................ 8-18
Accuracy calculations ......................................................................................................... 8-20
Calculating DC characteristics accuracy ................................................................................. 8-20

Keithley 3706A Specifications

General

Model	3706A
Category	System Switch/Multimeter
Voltage Range	100 nV to 300 V
Basic DC Voltage Accuracy	0.0035%
Basic Resistance Accuracy	0.01%
Maximum Channels	576
Maximum Voltage	300 V
Connectivity	LAN, USB, GPIB
Interface	LAN, USB, GPIB
Switching Matrix	Yes
Channels	576 (6-slot mainframe)
Maximum Current	3 A