Schiller AT-1 Service Manual

SCHILLER AT-1 3-Chmel ECG Unir
SERVICE WDBOOK Issue 3 September 1999
Chapter 5
Adjustments
Battery Charge Voluge
Precautions and Requirements
The unit must be placed on m anastatic mat and antistatic precautions observed when any
mmtenance is cam& out on the .AT- 1. The room temperature should be between 18 and 28O C.
Took and Equipment
Digital voltmeter
SmaU flat bladed screwdriver
Resistor 2.7 kOhms. 50 mW
Procedure
The batterychargevoltageisnominally 13.5 V(withanominal~rncurrentofappro~e1y
5 mA). Adjust and check as follows:
DISCONNECT THE iWS SUPPLY
Disassemble the unit as detailed in Chapter 4 and remove the ECG Amplifier MK11-2.
Remove the two battery connectors and connect a 2.7 kOhm 250 mW resistor across the
two connectors (TP12 and TP13) to simulate a discharged battery. Connect the digital
multimeter across the resistor.
Connect the Mains supply.
WARNING
mCISECARE- BE AWARETHATPOTENTIALLYLETHALVOLTAGES AREPRESENT
Adjust VR4 to obtain a charging voltage of 13.5 V.
Disconnect the mains supply and reassemble the unit as detailed in Chapter 4.
Page 5.7

Schiller AT-1 Specifications

General

Type	Electrocardiograph
Display	LCD
Recording	Thermal printer
Weight	2.9 kg
Power Supply	AC or battery
Channels	3