Constructional Layout Details; Chopper Amplifier Module - Time Electronics 1010 User Manual

Time Electronics
1010 DC Voltage Calibrator
3

Constructional Layout Details

The complete instrument assembly (except the Power Unit) is mounted on the front panel.
The main printed circuit board which carries the components and range switch is located
immediately behind the front panel. The panel and PCB can be removed as follows:
1) Remove Power Unit - located in instrument rear by 4 screws.
2) Disconnect supply - connected to power unit by 2 press stud connectors.
3) Remove the four front panel holding screws.
4) Withdraw front panel and PCB - the power supply lead can also be withdrawn
through a hole in the plastic power supply cover.
For recalibration the power supply can be connected without rehousing in the case.
3.1

Chopper amplifier module

3.1.1 Description
The module contains the F.E.T. Chopper amplifier, a precision LTC 5V reference device,
and associated circuitry. It is a fully encapsulated module and connections are via a 16-pin
connector moulded into it.
The modular form of the 1010's basic circuitry protects it from damage due to adverse
conditions and thermal gradients which could give rise to thermal emf errors.
Being a non-serviceable part, a replacement module should be ordered from Time
Electronics Ltd in the case of failure or malfunctioning of the module. The replacement part
number is 094-9512.
1010 DC Voltage Calibrator
User Manual
v1.2
Page 12 of 19