AP-6688B 5000V Insulation Tester UK
Answer first: The AP-6688B 5000V insulation tester UK buyers shortlist is a digital megohmmeter aimed at higher-voltage motors and long cables when 1 kV tools run out of headroom.
Who it is for
Maintenance teams stepping up from hand-crank or 1 kV-only meters, rewind shops needing a second digital unit, and contractors mobilising project toolkits.
OhmMeter lists the AP-6688B with a 200 GΩ range at £106.16—confirm live voltage steps and accessories on the product page before ordering.
Voltage discipline
Always match test voltage to the asset rating. A 5 kV capability does not mean every motor should see 5 kV—follow your site procedure and manufacturer guidance.
Frequently asked questions
Is 5 kV always required?
Only when the asset and procedure call for it; keep lower steps for appropriate LV checks.
What does 200 GΩ give you?
Headroom to see high insulation values on dry, healthy equipment instead of pegging a low-range meter.
Calibration paperwork
Procurement should confirm whether a certificate is included or ordered separately.
Second unit logic
If the first meter is always booked out across bays, a matching second unit reduces waiting.