Appendices
Specifications
A
A-5
Master Alarm Output Specification
The following specifications cover the Master Alarm output. The Master Alarm
output is located on the rear panel connector, terminals Master Alarm, and Signal
GND.
Table A-5. Master Alarm Output Specification
Specification Characteristic
Output Voltage - TTL Logical Zero
0.8 V maximum for an Iout of -1.0 mA (1 LSTTL
load)
Output Voltage - TTL Logical One
3.8 V minimum for an Iout of 0.05 mA (1 LSTTL
load)
Output Voltage - Non-TTL Load Zero
1.8 V maximum for an Iout of -20 mA
3.25 V maximum an Iout of -50 mA
Communication I/O
Communication with 2680 Series instruments can be accomplished through either
a 10/100BaseT interface or through an RS-232 port. The 10/100BaseT provides
the primary communication interface. The RS-232 is used for calibration and
limited debug capability.
2686A PC Card Storage
The 2686A supports a non-volatile PC Card (PCMCIA ATA type card) memory
module option. This table provides a list of active channels and the number of
scans to memory card capacity.
Table A-6. 2686A - Active Channels and Number of Scans to Card Capacity
Memory Card/
Active Channels
20 ch
40 ch
60 ch
80 ch
100 ch
120 ch
16
MB
100,548
66,765 50,074 40,059 33,382 28,613
128
MB
800,000 528,000 400,000 320,000 264,000 224,000
256
MB
1.6
M
1.056
M 800,000 640,000 528,000 448,000
512 MB
3.2 M
2.112 M
1.6 M
1.28 M
1.056 M
896,000
1 GB
6.2 M
4.224 M
3.2 M
2.56 M
2.112 M
1.792 M
Estimating space: 80 bytes/scan + 4 bytes/channel scanned (allow 4.5% overhead for card
formatting)
Summary of Contents for 2680A
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