Philips PM 6668 Frequency counter
The PM 6667
and PM 6668
are microcomputer based frequency
counters, spanning a frequency range of 10 Hz ... 120 MHz
, and 10 Hz ... 1 GHz (PM 6668
The use of the microcomputer allows a new approach in
frequency measurements, that eliminates the traditional ±1
cycle error. By making a multiple period measurement and
computing the reciprocal value, these counters perform high
resolution frequency measurements on low frequency signals.
Another microcomputer feature in these counters is the
automatic range selection. The measuring result is always
displayed with maximum resolution without overflow and with
proper indication of Hz, kHz, MHz and decimal point.
There is choice between two measurement rates; NORMAL
with 7-digits resolution every second or FAST with 6 or 7-
digits resolution every 200 ms. The fast mode is used for
measuring changing frequencies as with tuning.
The following options are available: a more stable time base
version with TCXO (/02 version), a rechargeable battery unit
PM 9601 that can be mounted inside the Counter
, an impact
resistant (ABS) protective carrying case PM 9602 and a 19"
rack/panel mount adapter PM 9603.
The 7-digit liquid crystal (LCD) display contains also the
unit and decimal-point indicators.
After you switch on the Counter
, a self test is executed.
Should an error be detected, it is shown on the display by a
3.44 Mbytes (3604700 Bytes)
english, german, french, italian, dutch
9499 463 01617
15 February 1986
Scanned document, all readable.
30 January 2017
Operating manual 2
Notice d’emploi 14
Istruzioni per I’uso 26
Service manual 40
Appendix, PM 9601 63
73.57 Mbytes (77145615 Bytes)
9499 463 01617
01 January 1987
Electronic document, no scan, very well readable.
29 January 2017