From 47557c6cabadc538684ecac364b5920db766bf0b Mon Sep 17 00:00:00 2001
From: DiamondJoseph <53935796+DiamondJoseph@users.noreply.github.com>
Date: Mon, 16 Oct 2023 15:13:11 +0100
Subject: [PATCH] Update src/dls_bluesky_core/core/maths.py

Co-authored-by: Tom C (DLS) <101418278+coretl@users.noreply.github.com>
---
 src/dls_bluesky_core/core/maths.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dls_bluesky_core/core/maths.py b/src/dls_bluesky_core/core/maths.py
index aaa9ebb..ff0779a 100644
--- a/src/dls_bluesky_core/core/maths.py
+++ b/src/dls_bluesky_core/core/maths.py
@@ -46,5 +46,5 @@ def in_micros(t: float) -> int:
         t (int): A time in microseconds, rounded up to the nearest whole microsecond,
     """
     if t < 0:
-        raise ValueError
+        raise ValueError(f"Expected a positive time in seconds, got {t!r}")
     return int(np.ceil(t * 1e6))