Philips PM2528 Operating Manual page 47

47
6.4.5, Ranging
By pressing the push-button AUTO the auto ranging mode can be switched on and off. The ranges are set
automatically by the PM2528 in the auto ranging mode (the LED in the push-button is on}, Ranges can
be set manual by pressing the push-button UP (higher range} or DOWN {lower range).
Depending on the setected function, a fixed block of ranges is available {see table below).
Function
200mv* 200mV¥ —250°C
2000mV 2000mV up to
20 Vv +850°C
200 v
2000 Vv
* Not in Vpeak function
In the auto ranging mode up-ranging occurs at 110% of range and down ranging starts at 10% of range.
In the table below the upranging limits and downranging limits are given for a 5%, 4% and 3% digit display.
UPranging DOWNranging
In the automatic ranging mode up-ranging and down-ranging can also be done manually, as can be seen in the
following example.
Select AUTO RANGING; LED in AUTO push-button lights.
Select V == by pressing V =.
Select HIGH RES; LED in HIGH RES push-button lights.
— Select INT START; LED in INT push-button lights.
— Supply a voltage V to the input sockets 0 and V Q Change V as listed below.
1
if
i
Displayed value Ranging Resolution
Input voltage V
2000,00mV
2.3V 02.3000 V AUTO UP 100uV
2.2V 02.2000 Vv 100nV
2Vv 2200.00mV MAN DOWN 10uV
(press DOWN}
In this way a high resolution can be reached between the ranging-limits.