Master Alarm Output Specification; Communication I/O; 2686A Pc Card Storage - Fluke 2680A Service Manual

268XA
Service Manual

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.
Output Voltage - TTL Logical Zero
Output Voltage - TTL Logical One
Output Voltage - Non-TTL Load Zero
Output Voltage - Non-TTL Load One

Communication I/O

Communication with 268XA devices 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. The standard Controller card will store approximately 600,000 readings.
Memory Card/
Active Channels
16 MB
128 MB
256 MB
512 MB
1 GB
Estimating space: 80 bytes/scan + 4 bytes/channel scanned (allow 4.5% overhead for card formatting)
1-10
Table 1-5. Master Alarm Output Specification
Specification
Table 1-6. 2686A - Active Channels and Number of Scans to Card Capacity
20 ch
100,548
800,000
1.6 M
3.2 M
6.2 M
0.8 V maximum for an Iout of -1.0 mA (1 LSTTL
load)
3.8 V minimum for an Iout of 0.05 mA (1 LSTTL
load)
1.8 V maximum for an Iout of -20 mA
3.25 V minimum for an Iout of -50 mA
40 ch 60 ch
66,765 50,074 40,059
528,000 400,000 320,000
1.056 M 800,000 640,000
2.112 M 1.6 M 1.28 M
4.224 M 3.2 M 2.56 M
Characteristic
80 ch 100 ch 120 ch
33,382 28,613
264,000 224,000
528,000 448,000
1.056 M 896,000
2.112 M 1.792 M