53230A-400 AGILENT TECHNOLOGIES, 53230A-400 Datasheet - Page 18

• Manufacturer Part Number: 53230A-400
• Description: Frequency Counter With GPIB Port, 12, 0.2 Ppm
• Manufacturer: AGILENT TECHNOLOGIES

Specifications of 53230A-400

• Bandwidth: 350MHz
• Counter Measuring Functions: Frequency, Period,Totalize, Ratio, Time Interval, Rise/Fall, Width, Burst Width, Duty Cycle, Phase, PRI, PRF
• Lead Free Status / RoHS Status: na

Definition of Measurement Error Sources and Terms
used in Calculations
Resolution enhancement factor (R
The resolution enhancement (R
capability that is achieved for a range of input signal frequencies and measurement gate times. The maximum enhance-
ment factor shown is for input signals where T
where T
For signals where T
Gate time > 1 s, R
Gate time 100 ms, R
Gate time 10 ms, R
Gate time < 1 ms, R
Interpolation between listed gate times allowed.
Single shot timing (T
Timing resolution of a start/stop measurement event.
Skew
Skew is the additional time error if two channels are used for a measurement. It is not used for width, rise/fall time, and
single channel time interval.
T
T
Threshold error (T
Threshold error (T
tainty or jitter. The total RMS noise voltage divided by the input signal slew rate
(V/s) at the trigger point gives the RMS time error for each threshold crossing.
For simplicity T
of all the edges used in the measurement. RSS of all edge’s T
alternative. Vx is the cross talk from the other standard input channel. Typically
this is -60 dB. Vx = 0 on 53210A, and when no signal is applied to other stan-
dard input channel on 53220A/53230A. (Note: the best way to eliminate cross
talk is to remove the signal from the other channel).
Threshold level timing error (T
This time interval error results from trigger level setting errors and input hyster-
esis effects on the actual start and stop trigger points and results in a combined
time interval error. These errors are dependant on the input signal slew rate at
each trigger point.
V
Phase Noise and Allan Deviation
The input signal’s jitter spectrum (Phase noise) and low-frequency wander characteristics (Allan variation) will limit the
achievable measurement resolution and accuracy. The full accuracy and resolution of the counter can only be achieved
when using a high-quality input signal source or by externally filtering the input
signal to reduce these errors.
Threshold level setting error (T
Threshold level setting error (T
old point due to the inaccuracies of the threshold circuitry.
Slew rate (SR)
Slew rate (SR) describes the input signal’s instantaneous voltage rate of change
(V/s) at the chosen threshold point at customer BNC.
For sine wave signals, the maximum slew rate SR= 2πF*V
For Square waves and pulses, the max slew rate = 0.8 Vpp/ t
Using the 100 kHz low pass filter will effect Slew Rate.
Signal noise (E
The input signal RMS noise voltage (E
The input signal noise voltage is RSS combined with the instruments equivalent
input noise voltage when used in the Threshold Error (T
calculation.
accuracy
accuracy
H
= 20 mV hysteresis or 40 mV when Noise Reject is turned ON. Double V
is the measurement error between two points in time.
SS
<< T
E
E
N
, R
used in the Random Uncertainty calculations is the worst T
)
E
E
E
E
) describes the input signal dependent random trigger uncer-
E
)
max of 6
SS
may be significantly higher than the specified levels. R
E
E
max of 2
= 1
max of 4
SS
>> T
)
E
, R
E
= √(F
LTE
E
LSE
LSE
) calculates the added frequency resolution beyond the basic reciprocal measurement
)
) is the uncertainty in the actual signal thresh-
)
continued
E
)
IN
N
* Gate/16) R
) measured in a DC - 350 MHz bandwidth.
SS
> T
E
E
is limited by gate time as show below
and is limited due to intrinsic measurement limitations. For signals
E
)
0 to PK
RISE 10-90
18
E
.
is an acceptable
E
H
will always be >=1.
E
values for frequencies > 100 MHz.
± T
±(0.2%-of setting + 0.1%-of range)
V/s (at threshold point)
SR
LSE-start
For 50v (5000µV
-start
For 5v (500µV
± T
SR
LSE-stop
SR
SR
-stop
-TRIG POINT
-TRIG POINT
± ½ V
2
[
2
+ E
SR
+ E
-start
N
2
N
H
+Vx
2
+Vx
- ½ V
2
)
2
SR
½
)
½
-stop
H
]