53230A Agilent Technologies Test Equipment, 53230A Datasheet - Page 17

• Manufacturer Part Number: 53230A
• Description: Universal Frequency Counter/Timer, 350 MHz, 12 digit/sec, 20 ps
• Manufacturer: Agilent Technologies Test Equipment
• Type: Counter/Timerr

Specifications of 53230A

• Frequency Range: DC coupled 1 mHz to 350 MHz; AC coupled 10 Hz to 350 MHz
• Input Impedance: Selectable 1 MΩ ±1.5% or 50Ω ±1.5%
• Input Type: Front panel BNC
• Input, Range: ±5 V (± 50 V) full scale ranges
• Noise: 500 μVrms (max), 350 μVrms (typ)
• Number Of Channels: 3 Channels
• Sensitivity: DC - 100 MHz: 20 mVpk > 100 MHz: 40 mVpk

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 signals T
T
R
Gate time 1 s, R
Gate time 100 ms, R
Gate time 10 ms, R
Gate time 1 ms, R
Single shot timing (T
Timing resolution between a single pair of start/stop edges.
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 channel. Typically this is -60 dB.
(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
values for frequencies > 100 MHz.
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 very 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 rms combined with the instruments equivalent
input noise voltage when used in the Threshold Error (T
calculation.
SS
accuracy
accuracy
E
H
= √(FIN * Gate_time/16) R
= 20 mV hysteresis or 40 mV when Noise Reject is turned ON. Double V
<< T
is the measurement error between two points in time.
E
, R
E
may be significantly higher than the specified levels, but will always be >=1.
E
N
E
used in the Random Uncertainty calculations is the worst T
)
= 6 (max)
E
E
E
) describes the input signal dependent random trigger uncer-
E
= 1 (min)Interpolation between listed gate times allowed.
)
E
= 2
= 4
SS
)
E
is limited by gate time as show below
LTE
E
LSE
LSE
) calculates the added frequency resolution beyond the basic reciprocal measurement
)
) is the uncertainty in the actual signal thresh-
)
SS
continued
E
)
> T
N
) measured in a DC - 350 MHz bandwidth.
E
and is limited due to intrinsic measurement limitations. For signals where
E
)
0 to PK
RISE 10-90
17
E
.
is an acceptable
H
E
± 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
N
-start
2
N
H
+Vx
2
+Vx
- ½ V
2
)
2
SR
½
)
½
-stop
H
]