Time Electronics 1077 Milliamp Transducer Simulator - Manual (Page 7)

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1077 Technical Manual P a g e | 7
1. Output Terminals
The output current is available on the two front panel terminals which are suitable for
normal wire compression or 4mm plug insertion.
2. Case Terminal
Connected only to the instrument case and is isolated from the circuitry. The case
provides an overall electrostatic screen and can be earthed as required to improve
rejection of noise pick-up.
3. Output On-Off Switch
Disconnects the output terminals from the 1077 circuitry. The 'Off' position provides
an open circuit on the output terminals.
4. Range and Supply On-Off Switch
Four press button switches with interlocking on the 3 range buttons to ensure that
only one range can be selected at one time.
5. Digit Switch
Four decade thumbwheel switches with 0-9 positions on each decade.
6. Voltage Limit Indicator
An L.E.D. display which indicates when the 1077 has insufficient voltage across its
output terminals to sink or drive the set current.
Important Note:
Voltages in excess of 40 volts across the output terminals will cause an
overload condition in the 1077 and the output fuse will blow.
7. Battery Level Indicator
Located on the side of the instrument and continuously monitors the battery voltage.
A minimum mark indicates when the batteries need recharging.
8. Re-charger Socket
Also located on the side of the instrument. The mains re-charger is a separate unit
and the output is via a flying lead with a non-reversible plug. Charge current is 50
mA and recharge time is 12-14 hours.
9. Load/Line/Source Switch
A three position switch which selects the function of the 1077.
10. LCD Meter
Displays the output current taken when operating in 'Line' mode (in Load/Source
mode displays Zero).
11. Output Voltage Adjustment
Sets maximum open circuit voltage in 'Source' mode and output voltage in 'Line'
mode (normally set for 24V output).