LAP-F1 Logic Analyzer
|
User Guide v1.6
| www.zeroplus.com.tw
30
NOTE
If the probes do not connect well to the DUT pins, users can try to use the
supplied clip-on (grip) connectors. Connect the signal lead to the clip-on
pin then, compress the clip-on to reveal two metal prongs that can be
hooked onto the contact points.
NOTE
To avoid large attenuation, the cable length between signal pad and the
DUT should not exceed 3 cm. This is achieved with the provided probes.
2.4.
eMMC Probe Tuning
NOTE
This procedure only concerns eMMC probes; the Trigger Voltage of TTL,
Low-voltage and Negative Logic probes are adjusted as described in
chapter 4.17.1.
2-7 shows an eMMC probe. Turn the tiny screw as explained in the steps
below to adjust the Trigger Level.
Figure 2-7 eMMC probe tuning screw
STEP 1
Connect the probe to the LAP-F1.
STEP 2
Connect the Dupont connector of the probe with a 50/50 clock signal or
another 50/50 signal that can be used as a reference.
STEP 3
Capture the signal. The aim of this exercise is to have the trace of the
acquisition show as equally long periods of high and low.
STEP 4
If more than 50% of the trace is high, turn the screw on top of the probe
clockwise to reduce the duty cycle and vice versa if more than 50% of the
trace is low.
STEP 5
Repeat steps 3-5 until the duty cycle of the reference signal is 50/50.