Keithley 2700, Service Manual

Page: 130 / 174

A-10 Specifications
GENERAL
32 CHANNELS: 32 channels of 2-pole relay input.
All channels configurable to 4-pole.
RELAY TYPE: Reed.
ACTUATION TIME: <1ms.
CAPABILITIES
CHANNELS 1-32: Multiplex one of 32 2-pole or one of 16 4-pole signals
into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-32): 300V DC or rms, 0.5A switched, 10W maximum.
Contact Life (typ): >5
×
10 4 operations at max signal level.
>10 8 operations cold switching.
CONTACT RESISTANCE: <1
Ω
at end of contact life.
CONTACT POTENTIAL: <±3µV typical per contact, 6µV max.
<±3µV typical per contact pair, 6µV max.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: 50 pin D-sub
×
2.
RELAY DRIVE CURRENT: 20mA per channel.
ISOLATION BETWEEN ANY TWO TERMINALS: >10 9
Ω
, <200pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10 9
Ω
, <400pF.
CROSS TALK (1 MHz, 50
Ω
Load): <–40dB.
INSERTION LOSS (50
Ω
Source, 50
Ω
Load): <0.35dB below 1MHz.
<3dB below 2MHz.
COMMON MODE VOLTAGE: 300V between any terminal and chassis.
ENVIRONMENTAL
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
Specified to 40% R.H. at 35°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.8kg (1.75 lbs).
Channel 1
HI
LO
Channel 16
HI
LO
(Channels 2–15)
Channel 17
HI
LO
Channel 32
HI
LO
(Channels 18–31)
Backplane
isolation
HI
LO
Sense
Backplane
isolation
HI
LO
Input
Channel 35
2-Pole (Closed)
4-Pole (Open)
(see Note)
To Model 2700
Backplane
NOTE Channels 33–35 in this schematic
refer to the designations used for
control and not actual available channels.
For more information, refer to the
ROUTE:MULT command section
in the Model 2700 User’s Manual.
Channel 33
(see Note)
Channel 34
(see Note)
Card Sense
HI
LO
Card Input
HI
LO
7703 32-Channel High Speed Differential Multiplexer