Operator`s manual

Signametrics 8
2.0 Specifications and Feature Table
Function SM4020
Standard
Scanner
SM4022
Instrumentation
Scanner
SM4040
Standard
Scanner
SM4042
Instrumentation
Scanner
Number of differential channels 20 40 20 40
Number of 10:1 groups two four two four
Scanning Arrangement Two groups of 10:1 differential Four groups of 10:1 differential
Thermal EMF offset (µV) 25 1.5 25 1.5
Maximum Switching DC Voltage (V) 110 220 110 220
Maximum Switching AC Voltage (V) 110 250 110 250
Maximum Switching Current (A) 1 1 1 1
Maximum Switching Current (A) 1 1 1 1
Typical inter-channel Capacitance 15pf 15pf 15pf 15pf
Insulation between open contacts ( MΩ,)
>100 >1,000 >100 >1,000
Insulation; contacts to coils (MΩ)
>100 >1,000 >100 >1,000
Insulation; adjacent channels (MΩ)
>100 >1,000 >100 >1,000
No Load Life 2X10
7
10
8
2X10
7
10
8
Loaded Life @ 50Vdc, 0.1A 3X10
5
10
6
3X10
5
10
6
Trigger input
√ √ √ √
Trigger output
√ √ √ √
Thermocouple Cold Junction Capable
√ √
Typical Closure Time (ms) 12 4 12 4
Typical Release Time (ms) 5 2 5 2
Actuation Time (ms) [1] 15 5 15 5
Actuation Time Settable Range (ms) 1 to 850 in 0.25 steps
AutoScan Period Range (ms) 1 to 850 in 0.25 steps
Available Configurations 2-wire, 4-wire,
universal, two-
groups
2-wire, 4-wire, 6-
wi
re, uni
versal,
two-groups, four-
groups
2-wire, 4-wire,
uni
versal
, two-
groups
2-wire, 4-wire, 6-
w
i
re, universal,
two-groups, four-
groups
Available Scan Groups A and B A, B, C and D A and B A, B, C and D
Isolated Relay Coil Drive
√ √
Maximum number of relays closed All All All 40
High Ohms range 1,000 Meg
√
[1] Actuation time is the time it takes to open any closed relays, and close the selected relay.
Table 2-1. Specifications and Feature table.
2.1 Trigger Input
Input Characteristics
• Input LED (nomi
nal 1.7V drop at 1mA) with a series 1kΩ resistor.
• Input Signal requirements >2.5 V, < 10 V to activ
ate. < 1V to deactivate.
• Isolation O
p
tically Isolated from all other circuitry. Common line with Trigger Output.