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| Specification
for Topward 1220 Frequency Counter |
| Frequency Range |
0.1Hz to 3GHz |
| Display Digits |
8 Digits 0.5" Green LED
Displays |
| FREQUENCY MEASUREMENT |
| Range (Direct) |
0.1Hz to 100MHz |
| Range (Pre-Scale) |
100MHz to 3GHz |
| Gate Time (Direct) |
0.01S, 0.1S, 1S, 10S |
| Gate Time (Pre-Scale) |
0.05S, 0.512S, 5.12S, 51.2S |
| Resolution (Direct) |
100Hz, 10Hz, 1Hz, 0.1Hz |
| Resolution (Pre-Scale) |
10KHz, 1KHz, 100Hz, 10Hz |
| Accuracy |
± (1 count + Timebase Accuracy +
Trigger Error) |
| INPUT SELECTION |
| Sensitivity (CH-A) |
(15mVrms) / 100MHz |
| Sensitivity (CH-C) |
-27dBm (10mVrms) / 2.7GHz; -21dBm
(20mVrms) / 3GHz |
| Impedance (CH-A) |
1MW |
| Impedance (CH-C) |
50W |
| Attenuator (CH-A) |
X1, X20 |
| AC / DC Coupling |
Only on Channel A |
| Low Pass Filter |
100KHz nominal 3dB point (Channel
A Only) |
| Trigger Level ADJ. |
Only on Channel A (+2.5VDC to
–2.5VDC) |
| TIMEBASE |
| Freq. (Direct) |
10MHz ± 10ppm |
| Freq. (Pre-Scale) |
19.53125MHz ± 2.5ppm |
| Power Source |
ACV 115V / 230V, ± 10%, 60Hz /
50Hz |
| Dimension |
10.3"(W) x 3.3"(H) x
10.2"(D) |
| Gross Weight |
3.5 lbs |
| Accessories |
ACS-003 BNC to clip X1, Operation
manual X1 |
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2000 
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