Philips PM2521 Operating Manual page 22

Counter measurements (Hz)
Ranges
Range selection
Resolution
Number of representation units
Accuracy for counter measurements
Gate time !.
Conversion rate
Trigger mode
Counter sensitivity
kHz
10 100
MHz
1 10
Range 100 kHz, 1 MHz and 10 MHz; Manual or automatic
Range 10 kHz; Manual only
0,1 Hz in range 10 kHz
99999
Range
Accuracy
10 kHz
100 kHz
1 MHz
± (0,005 % of reading +0,001 % of range)
10MHz ± (0,01 % of reading + 0,001 % of range)
Range Gate time
10 kHz
10 s
100 kHz
1 s
1 MHz
100 ms
10 MHz 10 ms
Range Rate
10 kHz 1 conv./IO s
100 kHz
1 MHz
10 MHz
1 conv./s
On positive going crossings of the + trigger level
•%
On negative going crossings of the — trigger level
DC to 1MHz 150 mV peak
1MHz to 10 MHZ 300 mV peak
Resolution; 1 mV
Trigger level adjustment
With thumbwheel at the front of the PM 2521