HP 53132A Assembly And Service Manual page 238

Time Base
Internal Time Base Stability
Temperature Stability:
(referenced to 25°C)
Aging Rate Per Day:
Per Month:
(after 30 days)
Per Year:
Turn-on stability vs. time:
(in 30 minutes)
Calibration:
Note that power to the time base is maintained when the counter is placed in standby via the front panel switch. The internal fan will continue to
operate under this condition, to maintain long-term instrument reliability.
External Time Base Input Specifications
Voltage Range: 200 mVrms to 10 Vrms
Damage Level: 10 Vrms
Time Base Output Specifications
Output Frequency: 10 MHz
> 1 Vpp into 50 Ω
Voltage:
(centered around 0 V)
Chapter 8 HP 53181A Specifications
Time Base
Standard
(0° to 50°C)
–6
< 5 x 10
–7
< 3 x 10
(referenced to 2 hours)
Manual Adjust
8-4
Medium Stability High Stability Oven
Oven (Option 001) (Option 010)
–7
< 2 x 10 < 2.5 x 10
–8
< 4 x 10 < 5 x 10
–7
< 2 x 10 < 1.5 x 10
–7
< 2 x 10 < 5 x 10
(referenced to 24 hours)
Electronic Electronic
External Time Base Input Characteristics
Threshold:
Impedance:
Input Capacitance:
Frequency:
Internal vs. External Time Base Selection:
Manual: Select Internal or External
Automatic: Internal used when External not present
(default)
Assembly-Level Service Guide
Ultra High Stability
Oven (Option 012)
–9 –9
< 2.5 x 10
–10 –10
< 1 x 10
–8 –9
< 3 x 10
–8
< 2 x 10
–9 –9
< 5 x 10
(referenced to 24 hours)
Electronic
0 V
1 kΩ
23 pF
1 MHz, 5 MHz or 10 MHz
(automatic selection)