Philips pm2521 - Page 53

52
ALTERNATING CURRENT MEASUREMENTS WITH CURRENT TRANSFORMER PM 9245
(Fig. 26, page 150).
— Select function A~ rms with the function selector.
— Select the manual or automatic ranging mode with pushbutton AUTO/MAN*
Remark:
Manual rqpging is indicated with a * on the display.
In automatic ranging mode the UP level is 2100 and the DOWN level is 0180.
— Select in manual ranging mode the correct range with pushbuttons UP or DOWN.
Remark:
Available ranges are:
mA terminal 0.2 A —20 A terminal
2.000 pA 200.0 mA
20.00 juA
2.000 A
200.0 pA 20.00 A
2.000 mA
20.00 mA
Only ranges 200 mA or lower are being used.
Overload is indicated with OL on the display (Display > 2100).
— Connect the current transformer PM 9245 to the PM 2521 as shown in Fig. 26, page 150.
Remark:
Before measuring, always connect the current transformer to the PM 2521 first. Avoid contamination of the
core-parts. The transfer factor of the PM 9245 is 1000 (100 A = 100 mA). The frequency range is 45 Hz up
to 1 kHz.
As the high current measurements with the PM 9245 are made in the A~ rms function of the PM 2521, they
have the same facilities as the alternating current measurements. Refer to Chapter 6.4.1.5.
6.4.2.3. Data hold measurements with probe PM 9263 (Fig. 27, page 150).
GENERAL
With the data hold probe PM 9263 the data on the display can be freezed while measuring. The data hold mode
^s valid for all functions except the s functions. In the s function the data hold mode switches on the special
trigger mode (Refer to chapter 6.4.1.10).
DATA HOLD MEASUREMENTS
— Connect the data hold probe PM 9263 to the PM 2521 as shown in figure 27, page 150.
— Select the desired function and measuring mode.
— Connect a zero lead to the 0 input of the probe.
This can be done in the following ways:
• With a separate banana-plug lead connected to the "0" input of the probe. This lead is not included in
the delivery of the probe.
• With a zeroing clip-on cable supplied with the probe on the probe-tip.
— Select the most suitable test pin for the probe-tip.
— Push the slide switch (white ring) on the probe in position RUNNING (away from the probe-tip).
— Place the probe-tip on the measuring spot and measure the input signal.
— Push the slide-switch, while measuring to position HOLD (towards the probe-tip). The data on the display
is now held (freezed).
Remark:
Only the data on the display is held. Meanwhile the PM 2521 continues measuring.
The maximum voltage between probe-tip Vfiand 0 is 30Vrms.